1.Tính nhanh:
a. 2 . 125 . 2002
b. 36 . 42 + 2 . 17 . 18 + 9 . 41 . 6
c.28.47 + 28 . 43 + 72 . 29 + 72 . 61
d. 26 . 54 + 52 . 73
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a)29 . (19 – 13) – 19 . (29 – 13)
= 29 . 6 – 19 . 16
= 174 – 304
= –130.
b)31.(-18)+31.(-81)-31
= 31. [-18 + (-81) - 1 ]
= 31. (-100)
= -3100
c)(7.3-3):(-6)
(7.3-3):(-6)
= (21-3):(-6)
= 18 : (-6)
= 3
d)72:[(-6).2+4)]
= 72 : ( -12 + 4 )
= 72 : -8
= -9
A,(36×28+36×28)÷73
=36x(28+28):73
=36x56:73
=2016:73
=2016/73
B,(98×17-26×17)÷72
=17x(98-26):72
=17x72:72
=17x(72:72)
=17x1
=17
1) $(-35)\cdot18+28\cdot35$
$=35\cdot(-18)+28\cdot35$
$=35\cdot(-18+28)$
$=35\cdot10$
$=350$
2) $53\cdot29-47\cdot(-29)$
$=53\cdot29-47\cdot(-1)\cdot29$
$=53\cdot29+47\cdot29$
$=29\cdot(53+47)$
$=29\cdot100$
$=2900$
3) $125\cdot(-24)+24\cdot225$
$=(-125)\cdot24+24\cdot225$
$=24\cdot(-125+225)$
$=24\cdot100$
$=2400$
4) $26\cdot(-121)-121\cdot(-36)$
$=-121\cdot[26+(-36)]$
$=-121\cdot(26-36)$
$=-121\cdot(-10)$
$=121\cdot10$
$=1210$
5) $65\cdot(-25)+25\cdot(-23)$
$=-65\cdot25+25\cdot(-23)$
$=25\cdot(-65-23)$
$=25\cdot(-88)$
$=-2200$
6) $237\cdot(-26)+26\cdot137$
$=-237\cdot26+26\cdot137$
$=26\cdot(-237+137)$
$=26\cdot(-100)$
$=-2600$
7) $30\cdot(-125)+25\cdot30$
$=30\cdot(-125+25)$
$=30\cdot(-100)$
$=-3000$
8) $(-37)\cdot69+(-31)\cdot37$
$=37\cdot(-69)+37\cdot(-31)$
$=37\cdot(-69-31)$
$=37\cdot(-100)$
$=-3700$
9) $31\cdot72-31\cdot70-31\cdot2$
$=31\cdot(72-70-2)$
$=31\cdot(2-2)$
$=31\cdot0$
$=0$
10) $(-12)\cdot47+(-12)\cdot52+(-12)$
$=-12\cdot(47+52+1)$
$=-12\cdot100$
$=-1200$
$\text{#}Toru$
vì bài dài nên mk chỉ ghi kết quả thui nha
a,0
b,19
c,-54
d,17
e,-100
f,65
t,17
y,65
o,63
p,0
3,
a,-10
b,-100
1 Tính :
a)5+(-5)=0
b)71-25=46
c)28+(-82)=-54
d)47+(-30)=17
e)(-41)+(-59)=-100
f)75+(-10)=65
t)26-43=-17
y)90-25=65
o)72+(-9)=63
p)(-3)+3=0
2 Tính nhanh :
a)(-150)-47+150-53
=(-150+150)-47-53
=-100
b)250+(-90)-250-10+100
=(250-250)+(-90)-10+100
=0
c)71+92-28-(-29)+8-72
=71+92-28+29+8-72
=(71+29)+(92+8)-(28+72)
=100+100-100
=100
d)45+(-31)-45+(-31)
=(45-45)+(-31+-31)
=-62
3 Tìm x biết :
a)x-5=-15
x=-15+5
x=-10
b)21+x=-79
x=-79-21
x=-100
c)x-15=-23+(-6)
x-15=-29
x=-29+15
x=-14
d)200-x=/-32/-41
200-x=32-41
200-x=-9
-x=-9-200
-x=-209
=>x=209
a)125.(-24)+24.225
=(-125).24+24.225
=24.[(-125)+225]
=24.100
=2400
Các câu khác bạn làm tương tự nha
a ) \(125\times\left(-24\right)+24\times225\)
\(=24\left[\left(-125\right)+225\right]\)
\(=24\times100\)
\(=2400\)
b ) \(26\times\left(-125\right)-125\times\left(-36\right)\)
\(=125\left[\left(-26\right)-\left(-36\right)\right]\)
\(=125\times10\)
\(=1250\)
a) 2 x 125 x 2002
= 2 x 25 x 5 x 2 x 1001
= (2 x 2) x 1001 x 5 x 25
= (4 x 25) x (1001 x 5)
= 100 x 5005
= 500500
b) 36 x 42 + 2 x 17 x 18 + 9 x 41 x 6
= 36 x 42 + 36 x 17 + 36 x 41
= 36 x (42 + 17 + 41)
= 36 x 100
= 3600
c) 28 x 47 +28 x 43 + 72 x 29 + 72 x 61
= 28 x (47 + 43) + 72 x (29 + 61)
= 28 x 90 + 72 x 90
= 90 x (28 + 72)
= 90 x 100
= 9000
d) 26 x 54 + 52 x 73
= 26 x 2 x 27 + 52 x 73
= 52 x 27 + 52 x 73
= 52 x (73 + 27)
= 52 x 100
= 5200
a) 2 . 125 . 2002
= 2 . 125 . 2 . 1001
= 500 . 1001
= 500 . 1000 + 500
= 500500
b) Sửa lại đề: 36 . 42 + 2 . 17 . 18 + 6 . 41 . 6
= 36 . 42 + 36 . 17 + 36 . 41
= 36 . (42 + 17 + 41)
= 36 . 100 = 3600
c) 28 . 47 + 28 . 43 + 72 . 29 + 72 . 61
= 28 . (47 + 43) + 72 . (29 + 61)
= 28 . 90 + 72 . 90
= 90 . (28 + 72)
= 90 . 100 = 9000
d) 26 . 54 + 52 . 73
= 26 . 2 . 27 + 52 . 73
= 52 . 27 + 52 . 73
= 52 . (27 + 73)
= 52 . 100 = 5200